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Please solve this and give full explanation and how we put in this cos please tell me

Please solve this and give full explanation and how we put in this cos please tell me

Question Image
Grade:12th pass

1 Answers

Aastha Singh
askIITians Faculty 210 Points
2 years ago
Dear student,

from formula:
sin2A = 2 sinA cosA ->equation 1

from question:
2 sinA cosA= sinA
2cosA =sinA/sinA
cos A = ½ ->eqn 2

since,
cos 60 =1/2 ->from theory
cos A = ½ →from eqn 2
A = 60 deg
hope this helps :)

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